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The quick method for a confidence interval for a proportion uses p ±1/√n as an approximation for a 95% confidence interval. The margin of error in this case is slightly larger than necessary. Suppose that a simple random sample of 500 motorcycle registrations finds that 68 of the motorcycles are Yamahas. Give a 95% confidence interval for the proportion of motorcycles in the population that are Yamahas using the quick method of chapter 3 and then by the more precise method of chapter 21.
What does the confidence level of a confidence interval tell you?
Suppose that a population has mean, µ, and standard deviation, σ. What does the central limit theorem tell us about the distribution of the sample mean?
Government regulations indicate that the total weight of cargo in a certain kind of airplane cannot exceed 310 kg. On a particular day a plane is loaded with 100 boxes of a particular item only. Historically, the weight distribution for the individual boxes of this variety has a mean of 3.2 kg and standard deviation 0.4 kg.
a. Interpret the meaning of the "a mean of 3.2 kg" in terms of repeated samplng.
b. what is the distribution of the sample mean weight for the boxes (give the name of the distribution and appropriate parameter values)?
c. What is the probability that the government regulation is met?
A study of a new anti-depressant drug took a sample of 10 individuals with high depression screening measures (DSM) and gave them the drug for three months. At the end of the thre
1-100,101-200
Show that for a single-output technology, Y is convex if and only if the production function f (z) is concave.
difference between historigram and histogram
Under this methods the enumerators are appointed and given training. They are provided with schedules containing relevant questions. These enumerators go to respondents with the
Less than 5 yrs 22 5-10 18 10-20 5 20-30 4 More than 30 1
Variation Coefficient The standard deviation discussed above is an absolute measure of dispersion. The corresponding relative measure is known as the coefficient of variation. Thi
The heights of a large population of adult females who play basketball are normally distributed with a mean of 175cm and a standard deviation of 7.5cm. (a) what proportion of this
Obtain the critical value (or values) for a hypothesis test for the mean if you conduct: (a) an upper tail "z" test at the 1% level of significance. (b) a two-tailed "z" test
give me tricks to solve assignments in economcis
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